Nu-alkylamino-alpha-hydroxy-alkanoic acid amides



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y 2,991,290 N-ALKYLAMINO-a-HYDROXY-ALKANOIC ACID AMIDES Seymour L. Shapiro, Hastings on Hudson, L'ouis Freedman, Mount Vernon, and Ira M. Rose, Yonkers, N.Y., assignors to US. Vitamin Uorporation, a corporation of Delaware No Drawing. Filed Mar. 20, 1957, Ser. No. 647,204 6 Claims. (Cl. 260-.619)

The group /RI N may be written as A.

When the values R R and n are selected within very narrow limits and when is a tertiary amino component, then the products are effective tranquilizers. They produce sedative without soporific effect when administered either orally or paren terally, as in the form of their salts.

The products, furthermore, have a very large margin of safety in such use; the ratio of the size of the lethal dose to the eiTect-ive dose, for significant reduction of motor activity of test animals, is as high as 40-75021 for representative ones of our compounds.

To obtain such results, it is necessary that R and R in the formula above be hydrogen, methyl, or other C;- C, alkyl, n, 3-6 and for best results 3 or 4, and --NR R a tertiary amino radical.

The invention comprises the new compounds of the Formula I and their salts, including the quaternary salts and tranquilizer compositions containing these products, either alone or in mixture with each other and in any case with an extender.

R and R in Formula I, more specifically, may represent the same or a different component including hydrogen, hydrocarbon radical such as a lower alkyl, cycloalkyl, aralkyl, or alkylene, oxyalkylene, haloarylalkyl, or aryl containing each 1-10 or up to 12 carbon atoms and forming, with the attached N, radicals that include dimethylamino, diethylamino, methylisopropylarnino, methylbenzylamino, methyl (-alpha-methylphenethyl) amino, ethylcyclohexyl-amino, ethylanilino, and such heterocyclic amine structures as indolinyl, tetrahydroquinolyl, and tetrahydroisoquinolyl. v t

The tertiary amino radical -NR R includes those radicals in which R and R are joined either directly or through an oxygen atom to form N-heterocyclic radicals 2 having 5-7 ring atoms illustrated by l-piperidyl, Z-methyll-piperidyl, l-pyrrolidyl, l-hexamethylenimyl, 4-morpholinyl and the like.

Salts of the tertiary amine pant of the molecule, i.e. of the amino group of Formula I are part of the invention. They include those of the compound I with the pharmaceutically useful and physiologically acceptable (non-toxic) acids including such mineral acids as hydrochloric, nitric, sulfuric, hydrobromic, and phosphoric and organic acids such as acetic, tantaric, and malic and the salt with 8-chlorotheophyllin. The term pharmaceutically useful. designates those acids whose salts are not substantially more toxic than the bases from which they are derived and which are compatible with various pharmaceutical extending media and, solvents with which our products are compounded. In the salts, the '1 1 RI T group becomes HA in which HA represents an equivalent weight of the becomes N .RiX R X representing an equivalent proportion of the quarternizing agent. When this agent is methyl chloride, for example, then R X is CHgCl.

GENERAL PROCESS OF MAKING DIALKYL- AMINOALKYLAMIDES The dialkylaminoalkyla-mides (I) may be prepared by conventional methods. The intermediates or startingmaterials used are selected, as to groups that remain "une changed during the reaction, to contain the same groups that are to appear in the final product. The tertiary amines required as intermediates are providedfiaswdescribed in a later section. I v Thus the esters (here the ethyl ester) of the alpha:

Patented July 4,

Rs heating AND TRANQUILIZING DOSAGES FOR ANIMALS There follows a discussion of the lethal and tranquiliz ing dosages of a number of our representative materials as determined by animal tests.

Lethal dosages.Toxicities have been established in terms of the minimum dose, milligrams of compound per kilogram of the test animals, which would be lethal to mice. This dose is subsequently abbreviated as LDmin. ng/kg. In Table I the compounds to be discussed are given a reference number and their lethal dosages are shown. Data on presently accepted materials (control compounds) are included for comparison. 1000+ means that a dosage in the ratio of 1000 mg. per kg. of mouse did not kill the mouse.

. The compound, Ref. No. 1 below was not toxic on PERMISSIBLE oral administration to rats at dosages as highas 5000 V ing/kg.

' Table I.-Values of components inthe generic formula The result J. Lab. Clin. Med. 45, 825 (1955); lsaac and Ruch, Science 123, 1170 (1956).

The compound Ref. No. 1, 2, etc. in the following tables as well as the controls are identified in Table I.

Table lI.-Efiect on spontaneous motor activity Dose mg.l Dose mg.l Reduction Compound Ref. No. kg. subeukg. oral in activity,

.taneous Percent 01 (control) 02 (control) 02 (control). 03 (control). 03 (control).

Comparison of the data from Tables I and II forthe control drugs with the compounds of this invention is favorable to our new tranquilizers.

Efiect of mescaline. scratch.--When mescaline is injected intraperitoneally into a mouse in the ratio of 100 mg./kg., the mouse will normally respond by scratching its body with its hind legs. The number of times the mouse repeats this operation in a specific time interval 7 is counted. If an eifective tranquilizing drug is admin- Rt 0 H a .a ii I i7ON-(CH1).=N R: 011 Re I and lethal dosage 40 Oom- LD I DOUIld min. R1 RI R] R R5 X 11 Ref. mg./ No. kg.

on, H on, OH; on. 1 3?? 011a H n-C4He Ill-C 11): 3 H H CH; CH 2Br 4 4 CH: CH: CsHs CzHr 4 Control compounds 01 750 Meprobemate (2-methyl-2-n-propyl-1,3-propenediol dicarbamat C2 100 Promizine (l0-(3-dimethylsminopropyl)phenothiazinc-hydrochloride). C3 Chlorpromizine(10-(3-dimethylam1nopropyl)-2clilorophenothizeine hydrochloride).

1 This is a blsquaternary containing 2 moles of I as shown plus 2 bromine atoms plus a divalent R5 here i The toxicity of this compound has been reported to be as low as 40 mEJkE. in the rat. J. Kopera, Brit. J. Pharm. and Chem. 9,392 (1954).

a :For characterization of tranquilizing effect on animals two kinds of tests were made as follows with the techniques, respectively, of the references cited.

Efiect on spontaneous activity.--In this test, the drug is administered to a rat and the rat placed in a cage wired with a counter which is responsive to movement of the rat. The counter records and sums up the extent of spontaneous activity of the rat. The duration of the experiment is 18 hours. Each rat acts as his own control by being given a drug one day and saline the next day. At least six rats are used at each dose level tested. Activity of a drug is reported in Table II as average percent change from the control result. Castenara et aL,

Table [IL-Reduction of mescaline scratch Compound Ref. N o.

EDnrngJkg.

The experimental data above characterize the compounds of this invention as etfect ive tranquilizing agents with essentially little or no toxicity in doses far above those required for the tranquilizing effect.

The overall procedure for the synthesis of the compounds of this invention has been described earlier herein. Compounds thus prepared are listed and characterized in Table IV.

In this Table -R --R n, and X have the meanings stated above. More specifically R is an organic radical such as methyl; ethyl, allyl, car'bethoxymethyl, benzyl, p-chlorobenzyl and the like. X is an anionic component of which examples are the halogens, methosulfate, and p-toluene sulfonate (tosylate). R X as defined is a quaternizing agent. R may also be hydrogen. In that case R 18 an acid that forms a salt with the amine compound I. P11 is phenyl. In a few instances R and R jointly represent a bivalent group, the first of which shown Table IV is -(CH;).,. R X when not shown to the contrary is zero, that is, not a component part'of the structure described.

Table I V.--Hydroxyamid'es O. Microns pressure al BrCHaCH=CHCH -Br I (2 moles amide to 1 of R5); '8-C1Theo H (CHn)2-0(CH2)2- flyclggexyl CH:

Pn-om "I PhCH -CHCHacm 11s 40 CQH5.-. 182-4 5M0 CH3I 107-8 BICH:OH=CHOH2BI 174-6 (2 moiesramide to '1 R5X).

Table I V.Hydroxyamides-Continued R =CHs R2=H n=4 Bolling point R R R X 6 0. Microns M 8 pressure III-(34:59..

The amines of the type used in synthesizing the amides of Table IV are either available commercially or are prepared as follows, for

instance, in making the series of compounds in which Some of the nitriles so prepared for the reduction are 7 shown in Table V.

Table V.--Dialkylaminopropionifriles (intermediates) Generic formula:

N-GHz-CHr-CN 4 Boiling point C. Mlcrons pressure Cyclohexyl CH3 74 60 D 02H 64-8 86 8000 I 112-8 60-70 CH:

Pitt-CH9 CH3 11o 1r, Pill-CH2 i-CaH7 98-100 30 PhCH:-C(CH;)H-.-- CH3 108-15 80-110 P11 CH3 l c 110 150 Ph C2115 105-22 150 Amines prepared by reduction of nitriles such as those shown in Table V are given in Table VI.

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Table Vl.--Dialkylaminopropy[amines Generic formula:

N-CHr-CHr-CHr-NH Boiling point C. Mtcrons pressure (iJH; 02-100 40-70 The intermediate aminoalkylamines where n=4 are available commercially but are also conveniently synthesized from the commercially accessible gamma-bromobutyronitrile by amination of bromine-bearing carbon and reduction of the gamma-tertiary aminom'trile thus formed to the substituted tertiary aminobutylamine.

The following examples of our syntheses are given for further illustration of the invention.

EXAMPLE 1 3 (N-mezhylanilino) propyIamiue.Beta(N-methylanilino) propionitrile (75., 0.46 mole) was dissolved in 900 ml. of absolute ethanol and heated to reflux. Sodium, g. (3.68 mole) was added, in pieces, as quickly as possible (15-25 min.) and reflux 'was continued until all the sodium had dissolved (2-3 hrs.). The hot solution was steam distilled directly and 900 ml. of distillate 1'01 moved. The formed product which separated in the pot was removed and dried over potassium hydroxide, filtered and distilled in vacuo, yielding 63.5 g. (85%) of amine boiling at 94/50 microns.

EXAMPLE 2 3-benzylmethylamino propionitrilep-N-benzylmethylaamine (72.5 .g., 0.60 mole) was mixed with 35.2 g. (ex, cess) of cold acrylonitrile and then 5 drops of Triton 9 13 solution were added. After refluxing for 4hours and standing for 16 hours, the reaction mixture-was fractionally distilled. There were obtained 93.8 g. (90%) of product boiling at 170/ 16 mm. (Triton B is benzyltrimethyl ammonium hydroxide, 40% in methanol.)

EXAMPLE 3 1l8/0.06-0.07 mm.

EXAMPLE 4.

N (morphvlinopropyl) alpha hydroxy isobutyr amide.A solution of 28.8 g. (0.20 mole) of N-(3-amino propyl)-morpholine and 30 ml. of ethyl alpha-hydroxyisobutyrate was refluxed over 5 hours and'the formed ethanol removed during the course of the reaction, The residue was fractionally distilled yielding 42.0 g. (91.3%) of -product boiling at 145 0.04 rrmt.

Anal.-Caled. for cuHlzNzog: N, 12.2. Found; N,

The methyl tosyl-ate, prepared in refluxing ethyl acetate, was recrystallized from a mixture of ethyl acetate, ethanol and ether, giving 27% of the quaternary salt, M.P. 77-81 C.

EXAMPLE 5 N-(3-dimethylaminopropyl) lactamide.-A solution of 20.43 g. (0.20 mole) of 3-dimethylaminopropylamine and 25 ml. of ethyl lactate was heated under reflux and the formed alcohol was removed by distillation. After 5 hours, volatile materials were removed in vacuo and the residue was fractionally distilled yielding 32.2 g. (92.5%) of product, B.P. 122/0.07 mm.

The methiodide was prepared in refluxing acetonitrile. It crystallized out of solution on the addition of ethylacetate in 84% yield, ,M.P. 123-124 C.

Anal.-calcd. for C H N O I: C, 34.2; H, 6.7. Found:

EXAMPLE 6 N (4-di-iso-propylaminobutyl) lactam:ide.'1his was prepared as in Example 5, from 12.0 g. (0.070 mole) of 4-di-iso-propylamino butylamine and ml. of ethyl lactate, yield 86%, B.P. 138-142" C./0.060 mm.

The methiodide prepared in ethanol, crystallized out of solution on dilution with ethylacetate in 70% yield,

M.P. 115-116 C.

EXAMPLE 7 This compound has the structure Br CH;

CHr-COOCzHs EXAMPLE 8 N-(4-diethylaminobutyl)-glycolam-ide.-This was prepared as in Example 5 from 18.0 g. (0.125 mole) of 4-diethylaminobutylamine and 15 ml. of ethylglycolateyyieldi.

s2. s%,B.P. 148-154 010.055 mm.

, EXAMPLE 9 N (3-dibutyl-amin0pr0pyl) alpha-hydroxy-iso-butyramide.-This was prepared as in Example 4 from 18.6 g; (0.10 mole) of 3-dibutylaminopropylamine and 16 ml. of .ethyl-alphahydroxy-iso-butyrate, in 51% yield, B.P. 132-140" CK/0.035 mm.

The methosulfate prepared in refluxing ethanol, crystallized on cooling and dilution with ether in yield 76%, M.P. 83-85 C.

Anal.-.calcd. for C H N SO S, 8.0 Found: S, 8.3.

EXAMPLE 10 7 N-(3-cyclohexyl-methyl-amino-propyl)alpha-hydro is0-butyramide.This was prepared as in Example 4 from 17.0 g. (0.100 mole) of 3-cyclohexyl-methyl-amino-propylamine and 15 ml. of ethyl-alpha-hydroxy-iso butyrate; yield, 81.8%, B.P. -148 C./0.06-'-0.07 mm. M.P. 56-58 C.

EXAMPLE 11 N-[3-(1-indolin0) propyl] glyc0lamide.-This was prepared as in Example 5 from 17.6 g. (0.100 mole) of 3-(1- indolino)propylamine and 12 m1. of ethyl .glycolate; yield 80.8%, B.P. 224-228 C./0.10-0.20 mm.

EXAMPLE 12 N (3 cyclohexylethyl-aminopropyl)lactamide.----This was prepared as in Example 5 from 14.0 g. (0.076 mole).

of 3-cyclohexylethylaminopropyl amine and 12 ml. of ethyl lactate; yield 87.4%, B.P. C./0.04 mm.

EXAMPLE 13 N (3 methyl-iso-propylaminopropyl) glycdlamida- This was prepared as in Example 5 from 10.5 g. (0.0807 mole) of 3-methyl-iso-propylaminopropyl amine and 12 ml. of ethyl glycolate; yield 75.7%, B.P. 134-1338" C./ 0.03-0.07 mm.

EXAMPLE 14 N-(S-benzylm ethylaminopropyl)lactam ida-This was prepared as in Example 5 from 15.0 g. (0.084 mole) of 3-benzylmethylaminopropyl amine and 11 ml. of ethyl lactate; yield 88.2%, B.P. 174178 C./0.065-0.12 mm.

EXAMPLE 15 .N-(3-ethylanilin0pr0pyl) glycolamide.-This was prepared as in Example 5 from 12.0 g. (0.0673 mole) of 3- ethylanilinopropyl amine and 9.0 ml. of ethyl glycolate; yield 83%, B.P. -198 C./0.0650.080 mm.

EXAMPLE 16 N-(3-methylanilinopr0pyl) lactamida-llhis was prepared as in Example 5 from 15.0 g. (0.0913 mole) of 3- methylanilinopropyl amine and 13.5 ml. of ethyl glycolate; yield 93.4%, B.P. 176 C./ 0.040 mm.

EXAMPLE 17 N (3 benzyl-iso-propylaminopropyl) glyc0lam ide.-- This was prepared as in Example 5 from 16.0 g. (0.0775 mole) of amine and 7.8 g. (0.0749 mole) of ethyl glycolate; yield 82.8%, B.P. 186190 C./0.03-0.05 mm.

EXAMPLE 1s N-(3-[Methyl-alpha-merhylphenethyl] amino propyl) lactamz'de.--This' was prepared as in Example 5 from 8.0 g. ((0.0388 mole) of 3-(methylalpha-methylphenethyl)- aminopropyl amine and 9.0 ml. of ethyl lactate; yield 90. 7%, B.P. 182 C./0.015 mm.

I ing, in an'appropriate solvent, the amine representing the final production in one of the examples above and then admixing an equivalent or a slight excess of a quaternizing agentof kind to supply the R and X groupstsee Table III) in the materials made in the examples below. "Thus in this Example 20, the said agent was benzyl chloride.

EXAMPLE 20 V The berizy chloride (quaternary) of'N-(3-dimethylaminopropyl)-alpha-hyarxy-isobutyramide, prepared in ethanol, crystallized on dilution with ethyl acetate in 79.8% yield, M.P. 202-203 C.

EXAMPLE 21 .The bis quaternary salt of 1,4-dibr0mobutene-2 and N- (4-dimethylaminobutyl)-glycolamide formed in ethanol in 94% yield, M.P. 174-176" C.

EXAMPLE 22 The aminoalkylamines of alpha-hydroxy organic acids representing the final product of Examples 1-19 are made into salts as follows:

Each one of the amines in turn is mixed with an equivalent weight of any one of the pharmaceutically acceptable acids described earlier herein, the mixing being made in contact with water, ethanol, ethyl acetate or like solvent in amount required, if any, to prevent undesired decomposition by the acid acting upon the said amine.

The salts so made are recovered by evaporation of the solvent at steam temperatures or lower. They may be recrystallized from the solvent by usual technique.

All of the final products of the examples above were submitted to ultimate analyses. The results for carbon, hydrogen and nitrogen agreed satisfactorily with the theoretical.

TRANQUILIZER COMPOSITIONS For use in tranquilizing compositions, the aminoalkylamides of alpha-hydroxy organic acids are extended by being mixed with an excipient so that the excipient extends between the particles of the active agent. Examples of such active tranquilizer agents or principles that we use are any of the final products of Examples 1-22, any of the compounds listed in Table IV, their salts with hydrochloric, phosphoric, sulfuric, acetic, tartaric, or malic acid, or with any of the alkylhalide or other R X quarternizing agents herein, examples of the latter being the methochloride, methobromide, and methoiodide of N-dimethylaminopropyllactamide.

The excipient used should be not only non-toxic under the conditions of use but also chemically inert towards the active principle. For oral administration they should be also at least reasonably palatable.

Excipients that meet the requirements and that may be used are the solid materials such as gum acacia, carboxymethyl cellulose, lactose dextrose and dextrine. The mixed active principle and excipient may be tableted with usual technique and equipment. When the tranquilizer is to be administered by injection, then the excipient or extender is a liquid solvent for the active principle. Water is satisfactory. There is no need to complicate the administration by the use of other liquid for this purpose. 7

The proportion of the active principle to the selected excipient may be varied over a wide range, as, for instance, from 5-50 parts by weight of the tranquilizing agent to 100 of the excipient. In making a solution for injection, the proportion of the said agent should not be above the saturation quantity, so that the agent dissolves in the excipient and remains dissolved during the injection step.

12 It is to'be-understood that it is intended to cover all changes and modifications of the examples of the invention herein chosen for the purpose of illustration which do not'constitute departures from the spirit and scope-of the invention. What is claimed is:

1. Aminoalkyleneamide bases having the formula:

o-coNHtonnn-n and salts thereof, in which R; and R, are selected from the group consisting of hydrogen and alkyl radicals having from one to four carbon atoms, n is an integer of from three to six, and A is selected from the group consisting of in which each of R, and R is selected from the group consisting of alkyl radicals having from one to four carbon atoms, cyclohexyl, phenyl and phenylalkyl radicals containing from one to three carbon atoms in the alkyl group thereof, and (2) N-heterocyclic radicals selected from the group consisting of l-indolinyl, tetrahydroquinolyl, tetrahydroisoquinolyl, l-piperidyl, Z-methyl-l-piperidyl, l-pyrrolidyl, l-hexamethylenimyl, and 4-morpholinyl.

2. The compound 3. The compound HO CHrC ONH(CH2)| 4. The compound References Cited in the file of this patent UNITED STATES PATENTS 2,009,144 Miescheret al July 23, 1935 2,425,392 Robinson et al. ...2 Aug. 12, 1947 2,715,645 Cusic Aug. 16, 1955 2,733,256 Krapcho et a1. Jan. 31, 1956 2,820,801 De Benneville et al ...Jan.,2l, 1958 2,826,578 Perron Mar. 11, 1958 OTHER REFERENCES Klarer et al.: Helv. Chim. Acta, vol. 27 (1944), pp. 1762-1776. 

1. AMINOALKYLENEAMIDE BASES HAVING THE FORMULA: 